2013 Scion FRS Exhaust Manifold bolts - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

jetrex · 06-02-2023, 11:25 AM

So I just resealed my timing cover. Found that my exhaust manifold couldn't be removed due to at least one bolts is cross threaded in the head. The only time the exhaust was ever off was when the valve recall was done back in 2019-2020.

Sooooo just awesome. I was going to install a oil baffle in the pan next. Anyone have any experience with something like this? Best possible advise would be great.

blsfrs · 06-02-2023, 12:30 PM

Could you send a picture of the "bolts"? Generally, there are 3 studs on each head with nuts to hold the manifold on. The studs are fairly long so it would have been quite an effort to run them all the up cross threaded. I've had older Subbies where bolts were used. Something could have gotten messed up when the recall was done.

NoHaveMSG · 06-04-2023, 02:22 AM

We don’t have manifold bolts, we have studs that are screwed into the head. Studs stay in the head unless damaged and need replaced. The manifold is held on with nuts. Likely just corroded or they flattened some threads when putting the manifold back on. Use a 6 point socket and be patient with it. Possibly may need some heat if it is just corrosion.

churchx · 06-05-2023, 06:41 PM

Quote:

Originally Posted by NoHaveMSG

We don’t have manifold bolts, we have studs that are screwed into the head. Studs stay in the head unless damaged and need replaced. The manifold is held on with nuts. Likely just corroded or they flattened some threads when putting the manifold back on. Use a 6 point socket and be patient with it. Possibly may need some heat if it is just corrosion.

So we won't shoot bolts when engaging NOS and "Danger to Manifold!"?

NoHaveMSG · 06-05-2023, 08:06 PM

Quote:

Originally Posted by churchx

So we won't shoot bolts when engaging NOS and "Danger to Manifold!"?

lol no, but you could pull the stud which would be just as bad.

jetrex · 06-06-2023, 09:22 AM

I may just do that. Take my time and heat it up. I appreciate the help guys. I may document this repair and put it up on here. Thanks again!

06-02-2023, 11:25 AM	#1
jetrex Member Join Date: May 2015 Drives: 2013 Scion FR-S Location: Orlando, Florida Posts: 42 Thanks: 0 Thanked 13 Times in 8 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	2013 Scion FRS Exhaust Manifold bolts So I just resealed my timing cover. Found that my exhaust manifold couldn't be removed due to at least one bolts is cross threaded in the head. The only time the exhaust was ever off was when the valve recall was done back in 2019-2020. Sooooo just awesome. I was going to install a oil baffle in the pan next. Anyone have any experience with something like this? Best possible advise would be great.

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06-02-2023, 12:30 PM	#2
blsfrs Senior Member Join Date: Dec 2018 Drives: 2013 frs base Location: central Virginia Posts: 1,107 Thanks: 1,719 Thanked 905 Times in 471 Posts Mentioned: 12 Post(s) Tagged: 0 Thread(s)	Could you send a picture of the "bolts"? Generally, there are 3 studs on each head with nuts to hold the manifold on. The studs are fairly long so it would have been quite an effort to run them all the up cross threaded. I've had older Subbies where bolts were used. Something could have gotten messed up when the recall was done.

06-06-2023, 09:22 AM	#6
jetrex Member Join Date: May 2015 Drives: 2013 Scion FR-S Location: Orlando, Florida Posts: 42 Thanks: 0 Thanked 13 Times in 8 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	I may just do that. Take my time and heat it up. I appreciate the help guys. I may document this repair and put it up on here. Thanks again!

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